Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7de7ddb6d6ad868…

MALICIOUS

PDF

86.2 KB Created: 2021-09-13 22:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0790ddaa0876b297a951c4bac3654d78 SHA-1: 71b10b467075408c3f7c2c461b728b978bb3a9d6 SHA-256: a7de7ddb6d6ad868c7103e023db761607bb55834c18dd40abb23c71e0404e5a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm indicators reinforces the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://heaig.org/editor/ckfinder/userfiles/files/95218923510.pdf In PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/18845482923.pdfIn PDF document text
    • http://gewald.ru/content/Files/71551306306.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/26760857686.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/xemekixiboxabosut.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/93599774931.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/71156330984.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/ridanatolujojatiju.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/39618895659.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/davigasomolaketo.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/vebiferitelororuzosote.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/powolixidujukugir.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/widanugutubaxi.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/76914811363.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/gokakidenap.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/bilomuw.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7nhtio5ou339q3rfgc2bqc8a2i/fofapulabomizopagusi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613587e3e9a36---zubogaj.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/15300301620.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e7atisgntdt2fnnmk582jm9mbj/90560016657.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/sapibeniropogasuwaxadugev.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/53533374352.pdfIn PDF document text
    • http://ned.ru/uploads/files/tuwoberozesewutexej.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/84499368460.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/98331318026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=apk+robux+modPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 17640 bytes
SHA-256: 43acb70074e6877293392cb8546aed70d32cee606f3e230784217caccb884b16
font_02_sfnt_off000134c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C1 10168 bytes
SHA-256: ebb60a2da4f77f2fb588753dcb4d404e89d288283911cfacc218201f9ef34e4b

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